<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>字体粗细示例</title>
    <style type="text/css">
        #p1 {
            font-weight: lighter;
        }
        #p2 {
            font-weight: normal;
        }
        #p3 {
            font-weight: bold;
        }
        #p4 {
            font-weight: bolder;
        }
    </style>
</head>
<body>
    <p id="p1">字体粗细为：lighter</p >
    <p id="p2">字体粗细为：normal</p >
    <p id="p3">字体粗细为：bold</p >
    <p id="p4">字体粗细为：bolder</p >
</body>
</html>